using namespace std;
#include <iostream> 

int main ()         
{
  float x,y;             
  
  cout << "Dammi un numero reale x: ";  
  cin >> x;  

  cout << "1/2*(x*x) + 2/3*x = " << 1.0/2.0*(x*x) + 2.0/3.0*x << endl;  
  
return 0;
}